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Preparation of High-Density Polymer Brushes with a Multihelical Structure
Langmuir ( IF 3.7 ) Pub Date : 2018-02-14 00:00:00 , DOI: 10.1021/acs.langmuir.7b04167 Tomoki Kato , Masanao Sato , Hitoshi Shimamoto , Kiyu Uno , Kazutoshi Yokomachi , Yuko Konishi , Kazutaka Kamitani , Maiko Nishibori 1 , Noboru Ohta 2 , Ryohei Ishige 3 , Kevin L. White , Nobuyuki Otozawa 4 , Tomoyasu Hirai , Atsushi Takahara
Langmuir ( IF 3.7 ) Pub Date : 2018-02-14 00:00:00 , DOI: 10.1021/acs.langmuir.7b04167 Tomoki Kato , Masanao Sato , Hitoshi Shimamoto , Kiyu Uno , Kazutoshi Yokomachi , Yuko Konishi , Kazutaka Kamitani , Maiko Nishibori 1 , Noboru Ohta 2 , Ryohei Ishige 3 , Kevin L. White , Nobuyuki Otozawa 4 , Tomoyasu Hirai , Atsushi Takahara
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It is well-known that a mixture of isotactic and syndiotactic polymethyl methacrylate (PMMA) forms a stereocomplex consisting of a multihelical structure in which an isotactic chain is surrounded by a syndiotactic chain. Here, we report the basic structure of the stereocomplex formed when the syndiotactic PMMA chains are tethered to a silicon substrate and form a high-density polymer brush. The influence of geometric confinement was investigated by preparing the high-density polymer brushes on a flat and spherical substrate. In both cases, mixing the untethered isotactic PMMA with the grafted syndiotactic PMMA led to the formation of a stereocomplex with a multihelical structure. Static contact angle measurements showed a hindered surface mobility at the outermost surface of the polymer brush, indicating that the stereocomplex forms a crystalline structure. A syndiotactic polymer brush with substituted fluoroalkyl groups was prepared to increase the contrast for grazing incidence wide-angle X-ray diffraction (GIWAXD) measurements. The GIWAXD results verified that the stereocomplex forms a crystalline structure oriented perpendicular to the substrate with a relatively low degree of orientation.
中文翻译：
具有多螺旋结构的高密度聚合物刷的制备
众所周知，等规和间规聚甲基丙烯酸甲酯（PMMA）的混合物形成由多螺旋结构组成的立体络合物，其中等规链被间规链包围。在这里，我们报告了间同性PMMA链拴在硅基板上并形成高密度聚合物刷时形成的立体复合体的基本结构。通过在平面和球形基底上制备高密度聚合物刷，研究了几何限制的影响。在这两种情况下，将未束缚的全同立构PMMA与接枝的间同立构PMMA混合会导致形成具有多螺旋结构的立体复合物。静态接触角测量表明，聚合物刷的最外表面的表面迁移率受阻，表明立体复合物形成晶体结构。制备具有取代的氟代烷基的间同立构聚合物刷，以增加对比度，以进行掠射入射广角X射线衍射（GIWAXD）测量。GIWAXD结果证实了立体复合物形成了垂直于基材取向且取向度相对较低的晶体结构。
更新日期：2018-02-14
中文翻译：
具有多螺旋结构的高密度聚合物刷的制备
众所周知，等规和间规聚甲基丙烯酸甲酯（PMMA）的混合物形成由多螺旋结构组成的立体络合物，其中等规链被间规链包围。在这里，我们报告了间同性PMMA链拴在硅基板上并形成高密度聚合物刷时形成的立体复合体的基本结构。通过在平面和球形基底上制备高密度聚合物刷，研究了几何限制的影响。在这两种情况下，将未束缚的全同立构PMMA与接枝的间同立构PMMA混合会导致形成具有多螺旋结构的立体复合物。静态接触角测量表明，聚合物刷的最外表面的表面迁移率受阻，表明立体复合物形成晶体结构。制备具有取代的氟代烷基的间同立构聚合物刷，以增加对比度，以进行掠射入射广角X射线衍射（GIWAXD）测量。GIWAXD结果证实了立体复合物形成了垂直于基材取向且取向度相对较低的晶体结构。
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